Blumenthal is scheduled to announce his request to the companies in Hartford Monday morning. He'll be joined by Jennifer Harris, director of marketing initiatives at Yale University's Rudd Center for Food Policy & Obesity.

The Connecticut Democrat says Red Bull and Rockstar both claim to not market to children, but a toy car with Red Bull's logo and a toy boat with Rockstar's logo can be found at retail stores. He plans to show examples of the toys at the announcement.

Blumenthal cites public health concerns about how high levels of caffeine affect children.

The two companies didn't immediately respond to requests for comment Monday.